Convective precipitation occurs due to thermal convection currents caused due to insolational heating of ground surface. Thus it occurs due to temperature difference.
Cyclonic precipitation occurs due to the upliftment of air due to pressure difference.
Frontal precipitaiton is special type of cyclonic precipitation which occurs at the interface of warm and cold air masses on their convergence.
Orographic precipitation occurs due to ascent of air forced by presence of mountain barrier.